Contract ER521A is comprised of the widening of the existing PIE-Airport Boulevard slip road from 2-lane to 3-lane, including the design and construction of a new vehicular bridge over the existing Changi Airport Diversion canal with approach slabs, utility bridge for PUB water pipes, widened RC canal, drain and ancillary works.
The 3-span vehicular bridge has a total length of approx. 70m, comprising of precast prestressed T-beams with composite deck slab resting on RC Capping Beam and supported by rows of bored piles. Bridge deck is cast in-situ: prestressed precast beams with composite deck slab monolithically connected to cast-in situ crossbeam at intermediate piers and abutments location. The proposed bridge consists of carriageway, footpath and flower trough. The proposed canal is cast in-situ reinforced concrete open u-drain and proposed drain is reinforced concrete U-drain (RCU), box-drains, culvert (RCBC) and sump (RCS).